Mamiya M645 1000S, Инструкция по эксплуатации

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Mirror Lock-up
When the camera is mounted on a tripod and you are shooting at
slow shutter speeds, the small amount of vibration caused when
the mirror returns to its down position may cause blurring of the
image. Mirror vibration may be eliminated by locking the mirror in
the up position before making an exposure.
1. To lock the mirror in the up position, move the Mirror Lock-up Lever (23)
backwards until it is horizontal. The lever may be moved either before or
after cocking the shutter.
2. With the shutter cocked, release the shutter using a cable release, and then
cock the shutter, which may be done with the mirror in the up position.
3. Return the mirror to its down position when you have finished mirror lock-up
photography.
For mirror lock-up photography with the 70mm leaf-shutter lens, refer to the
instructions included with the lens.
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